I have noticed the rain collector on my Vantage Pro started showing less and less amounts of rain after a lite, heavy or a all day rain event. This didn't happen over night. Been doing this for over a year now.

I see nothing wrong when I open the unit up.. I started to adjust the two screws for the dippers as per a phone call to Davis techs. Seems I'm getting close to correct rain reading now BUT can't figure out why I had to do this in the first place when it's been fine for years.